Shaking ore-screen.



m2771317. PATBNTED DEG. 13, 1904.

' J. .TRAYLOR.

SHAKING ORE SCREEN.

APPLoATIoN YILBD MAR. z5, 1904.

N0 MODEL.` 3 SHEETS-SHEET 1.

bq L0 i n NB v u? 5in/mank@ a #d @if L() l 0,4 f t Wr. F V 4h27/ 623%,i? n www No. 777,31?. PATENTED DEG. 13, 1904.

' J. A. TRAYLOR.

SHAKNG URE SCREEN.

APPLIDATIN FILED MAB.. 25, 1004..

N0 MODEL. 3 SHEETB-SHEBT 2.

2% f E m FH u i IN N 'a No. 777,31?. PATENTBD DEG, 18, 1904. Cf. A.TRAYLOR.

SHARING ORE SCREEN.

APPLICATION FILED MAE. 25, 1904.

N0 MODEL. GBHEETS-BHEET 3.

weyf, 1 massa: I

lhvirnn Srarns Patented December 13', 1904.

JOI-1N A. TRAYLUR, OF DENVER, COLORADO.

SHKIING OHEWSCHEEN.

SPECIFICATION forming part of Letters Patent No. 777,317, dated December13, 1904.

Application led March 25,1904. Serial No. 199,987. (No model.)

To (if/ZZ whom t 11i/ay con/cern.'

Be it known that l, JOHN A. Taarten, a citi- Zen oi' the United Statesof America, residing in the city and county of Denver and State ofColorado, have invented certain new and useful Improvements in Shaking'Ore-Screens; and l do declare the Yfollowing to be a t'ull, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, and to the lligures of referencemarked thereon, which term a part of this speciiication.

My invention relates to improvements in screens; and the objects of myinvention are, iirst, to provide a screen ior screening ore and othermaterial that operates with a vertical reciprocal resilient impingementagainst an abutment at the end of its upward vertical stroke and thathas a vertical rocking horizontal reciprocal movement that moves thescreen in alternately-opposite directions to the alternate verticalrocking movements 0i." said screen; second, to provide a screen having aa bodily-adjustable resilient vertical reciprocal bumping movement, and,third, to provide a resiliently-suspended screen provided with avertically-impinging bumper-cradle movement, combined with a cooperatinghorizontally-reciprocating cradle movement.

I attain these objects by the mechanism illustrated in theaccoi'npanying drawings, in which-d Figure 1 is a plan view oil myimproved screen and attachments, showing the same mounted upon asuitable supporting-trame. Fig. 2 is a transverse sectional View throughthe screen and supporting-frame, taken on the line 2 2 of Fig. l. Fig. 3is a longitudinal vertical sectional view on the line 3 3 of Fig. 1.Fig. l is an end view of the feed end of the screen. Fig. 5 is alongitudinal vertical sectional view on line 5 5 of Fig. 1. Fig. 6 is acontracted perspective view of the metal frame which supports thescreen-frame, and Fig. 7 is a View illustrating the operation oi' thebumping mechanism which actuates the screen-holding casing.

Similar numerals of reference refer to similar parts throughout theseveral views.

Referring to the drawings, the numerals .l and 2 and 3 and t designate arectangular iframe, which l term the i supporting-lrame oil my machine,the numerals 1 and 2 designating suitable sized side rails, which arepreterably made or wood, and the numerals 3 and t the cross end pieces,which are also preferably made of wood and are secured to the side railsby bolts 5 or by other suitable means. '.lo the side rails 1 and 2 oi'the supporting-frame I secure :t'our brackets 7, 8,- 9, and 10. Thebrackets 7 and 8 are placed opposite eachother, as are also the brackets9 and 10, and at a distance apart to support between them atpredetermined points adjacent to its ends a screensupporting frame l1.These brackets are bolted to the side rails of the supporting-irame bybolts 12. lA preferably make these brackets in substantially the formoit' a Z and secure the vertical and the lower horizontal arms to theside rails. The top arm of these Z-shaped brackets terminates at its endin a pair oi' depending semicircular lugs that are spaced at a shortdistance apart and form a depending yoke 13 on each bracket.

l pivotally secure to the yoke 13 of each bracket one end of four links14, preferably by four pinsl, which are secured in the yokes by splitpins 16. Each of these four links depends normally vertically downwardYfrom their yokes at the end of the brackets, and at their lower endsthey are pivotally secured to one end of four other links .17 and to twoyokes 18, 'formed on the end oi' two connecting-.rods 19. The yokes 18straddle both of the links ot the brackets 7 and 8, and the ends oi'these two links and the yokes are pivotally connected together.preferably by pins Q0, which are provided with heads that arecountersunk into one side of the yokes, while the opposite ends of thepins are provided with split pins 21. The opposite ends of the fourlinks 17 are pivotally secured between upwarrlly-projecting lugs 23 bypins 25. These lugs are :formed on top ol? four bed-plates E2G, whichsupport the screen-supporting iframe. lhese lugs project upward from thecentral portion of the bed-plates, which extends a sufficient distanceon each side of the lugs to form shelf portions on each side of them.Upon the inner shelf of each pair of these bed-plates I place angledirons 28 and 29, that have arms of unequal lengths, placing them on theplates with their longest arms standing vertically and against theadjacent lugs, to which I secure them by rivets 25". The pins 25 alsopass throug'h the angle-irons and are countersunk iush with the side ofthe angle-irons. The pins are secured to the lugs by split pins 30,which are placed through the ends of the pins which project beyond thelugs. By reference to the cross-sections, Figs. 2 and 4, it will be seenthat these bedplates 26 are suspended by the links 14 and 17 (eightlinks) from the end of the four brackets 7, 8, 9, and 10, that arefastened to the opposite side rails 1 and 2, and on these bed-plates theangle-irons 28 and 29 are placed opposite each other, these bed-platesand the angle-irons forming a casing in which the screen 30 is placed.The ends of these angleirons 28 and 29 are connected together by smallerangle-irons 31 and 32, one arm of each of which extends under thehorizontal arms of the angle-irons 28 and 29, and other arms are bentaround against the outer sides of the vertical arms of the side anglesand are riveted to them, as shown in Fig. 6. These side and end angle-irons form cooperatively a square casing for the screen 30, whichcasing is suspended by the eight links from the four brackets of theside timbers. One of the important features of my invention is, however,that this screen-supporting casing shall be under a constant upwardpressure against the links and the brackets instead of hanging of theirweight from them. I 'accomplish this feature of my invention in thefollowing manner: rIhrough the top arm of each bracket I form apertures33, through each of which a rod 34 hangs loosely and vertically. Theserods are supported by nuts 35, that are threaded to the ends of therods, and washers 36 surround the rods below the nuts and reston springs37, one end of which rests on the tops of the brackets, and the washersrestion the opposite ends. On the lower end of these rods eyes areformed that are connected to eyebolts 38, that are secured to thebed-plates. The nuts at the tops of the rods are screwed down tocompress the springs enough to continuously hold the entirescreen-sujiiporting casing Linder an upward expansive springpressuresuiiicient to cause them to assist or act in conjunction with the linksto raise the screen against its bumpers, as will be explained more fullyhereinafter.

Each pair of links that connect the screensupporting frame to thebrackets forms a toggle-joint, and I connect the center of each toggleon each side of the screen-frame to connecting-rods 19, which on one endare pivotally secured to the pins 2O and to the links 14 and 17, asabove described. The opposite ends of theseconnecting-rods are pivotallyconnected, respectively, to the lower ends of two rock-arms 39 by pins40. The upper ends of these arms are secured to a rock-shaft 41, that ismounted in boxes 42, which are secured on the side timbers 1 and 2. Thelinks of the brackets 9 and 10 are pivotally connected by pins 43 inslots that are formed centrally through the connecting-rods. Theseconnecting-rods are made of three pieces each, 45, 46, and 47. rIhepieces45 are links that form one end of the connecting-rods,

and they are ypivot-ally connected at one end to the rock-arms 39. Theopposite ends of these links are pivotally connected to yokes 46A,formed on the ends of the pieces 46 of the connecting-rods. The twopieces of the connecting-rods 46 and 47 are connected together bylongitudinally-adjustable couplin gs,

which comprise threaded rods 48, one end ofA which screws into threadedholes that are formed in the free end of the pieces 47, and' theiropposite ends thread into threaded holes that are formed in the ends ofthe free ends of the pieces 46. The rods 48 are each provided with twonuts 51, which screw up against the ends of the pieces 46 and 47 andlock them to the threaded rods in adjusted positions. rIhese adjustableconnections permit the relative distances between the links to beadjusted to permit both sets of links to depend vertically should thedistances between the brackets vary in the construction .of a number ofthese screens, while the links make jointed connections between theconnecting-rods and the arms that permit independent movement of each.The rock-arms 39 receive their oscillating motion from an eccentric 52and 56 and the eccentric-rods 53 and 57, the eccentric being secured toa shaft 54, that is journaled in boxes 55, which are screwed to the sidetimbers 1 and 2. The free end of the rod 53 is provided with a threadand with nuts 56A and 58 at opposite ends of the thread. Collars 57A and59 are placed against each nut on the threaded portion. The free end ofthe connecting-rod extends loosely through an arm 60, that is secured tothe shaft and is held normally centrally between the nuts and collars bytwo coiled springs 61 and 62, which are placed on the rod between thecollars and the opposite sides of the arm, against which they are heldunder an equal and suitable expansive pressure to operate the links, asdesired, as will be explained hereinafter.

To the shaft 54 I secure an eccentric 56A, which is provided with aneccentric rod. The opposite end of this eccentric-rod 57 is pivotallysecured by a bolt 58l to a clip 59, that is secured to the bottom of theend angle-iron 32 at the center of its width. Upon one end of the shaft54 a power-receiving IOO IIO

IZO

pulley is secured. Adjacent to each corner of the screen-supportingcasii'ig and tothe outside of the angle-irons 28 and 29 l secure fourshort vertical arms or buffer-standards 6l by bolts 62, the top of eachof which extends over and is set into a notch formed in the top of theangle-irons. The tops of these l cover with one or more thicknesses ofleather, which are secured to opposite sides of the standards withscrews (52, and to the side rails opposite each of these four standardsI secure four Z-shaped angle-irons 6 the top of each of which extendsdirectly over the top of the bu derstandard. adjacent to it.

Through the top of each bracket l insert adjustable screws 63", which lterm adjustable buffer-screws.7 l place these screws in position tostand directly over the builerblocks. The lower ends of these adjustablebuffer-screws are provided with heads, and their upper ends are providedwith checknuts 66, which are threaded to the screws on top of thebrackets to lock the screws in ady justed positions. These buffer-blocksare made wider than the heads of the screws transversely of thelongitudinal movement of the screen-frame, and they are `made enoughlonger than the length of the adjustable bumper-screws in order that thebufferblocks may strike them at the opposite ends of the horizontalreciprocating' stroke of the screen-casing and screen 30. comprises ascreen-supporting sash 67, which fits loosely into and rests on thelower-arms of the angle irons 28, 29, 31, and 32 of the screen-supporting casing. The sash G7 is provided with cross-supports 68. Thissash is adapted to support wire-screen cloth of any size mesh from thecoarsest it is practical to use for screening material to the finest.

ln screening ores for subsequent treatment to recover their values bythe several processes in use screens varying from four to one hundredmesh are employed, and screens varying from twenty to eighty mesh aremost generally employed. Screens of this iineness when supported by openframework inval-i ably sag Linder the continual weight of ore underrapid agitation and will soon cut out or break at the edges of the sash,and I have found in practice that it is necessary to more evenly supportthe entire body of the screen to avoid its breaking and enable it towear evenly until worn out by the ore. I carry out this feature of myinvention in the following manner: *Over the top of the sash I lirstsecure a sheet of coarse-wire screen, which I term the screen-bed. lpreferably make this screen-bed of about one-inch mesh and secure ittightly to the top of the sash with suitable tacks, nails, or screws,and preferably sink that part of it that rests on the crosssupports ofthe sash into them until the top of the screen is flush with them, whichgives The screen 30` additional stiffness and rigidity to thisscreenbed. I then lay a sheet of screen-cloth of the desired [inenessover the screen-bed and secure it to the sash with tacks or nails orscrews. This screen-bed bodily and evenly supports the screen throughoutits extent and ell'ectually prevents it from sagging' enough to crackand break it.

l secure the screen and its sash in the casing by means of tworei'novable side strips 68 and 69, which are preferably iliade of wood.These strips are clamped down on top of the screen and sash at itsopposite sides by the adjustable screws 7() at one of their ends and theswinging bolts 7l at their opposite ends. rlhe adjustable screws 69 arethreafiledly secured in the top of angle-irons 72, that are secured tothe side of the end angle-iron 31. The top of these screws is adapted toreceive a wrench, and the screws are turned against the ends of thestrips, which are simply slipped under them, and they are clamped downagainst the screen and sash. The opposite ends of the screen-clampingstrips are bifurcated to form a yoke, and the swinging' bolts 70 arepivotally connected to a clip 72A, that is secured to the end angleiron32. These bolts swing up into the slots of the yokes, and their nuts areturned to clamp the strips and the screen and sash to the casing.

A feed-hopper which l illustrate in Figs. 2 and 3 only, is arranged inoperative relation to the feed end of the screen. This feed-hopper maybe of any suitable form or construction that is adapted to feed the oreevenly and regularly onto the entire width of the end of the screen.This hopper is outlined in dotted lines in Fig. 2 and is shown partiallybroken away in Fig. 3. It is set between the side clamps of the screenand is supported far enough above it to allow the screen operativemovement by rods 73, which extend to and are secured to the side rails land 2. 1n the practical operation of my improved screen it is set at adownward inclination that will permit the ore to flow from the hopperonto the screen and move over its surface toward its discharge end onlyas fast as the iines that are in the ore will settle out of the ore andsift through the screen. In general mill practice several screens arearranged in tandem order, each one from the first to the last beingprovided with a coarser screen than the first screen, which should bethe finest, so that the second may screen the tailings from the lirstand the third the tailings from the second.

The operation of my improved screen is as follows: Power being appliedto the shaft 54, the eccentric imparts a horizontal cradle-like movementto the screen-casing and the screen and sash, as the casing is suspendedby the -toggledinks from the brackets 7, 8, 9, and 10.

A reciprocating movement is also imparted by the eccentric 52 and itsrod to the :rock- IIO arm 60, which imparts an oscillating motion to therock-shaft 41, which in turn imparts, through the medium of therock-arms 39, a reciprocating motion to the connecting-rods 19, and theconnecting-rods, owing to their being connected to the links which liftthe screen against the bumpers and impart a vertical reciprocatingcradle like movement to the screen, which, taken in connection with thecompensating springs 61 and 62 and the rockarm on the connecting-rod 53of the eccentric 52,' acts as follows: The adjustable bumper-screws areset to give any desired practical vertical movement to the screen, andassuming that a moderately-violent vertical stroke is desired theadjustable bumper-screws are set so that the bumper-blocks will strikethe heads of the screws before the connectingrods and the toggle-linkshave made their full stroke; but as the connecting-rod 53 of theeccentric must make its full stroke the difference in the strokes iscompensated and each is allowed to work independent of the other bymeans of the springs 61 and 62, which are compressed against theopposite sides of the rock-arm 60 by the full strokes of theconnecting-.rod 53 during its reciprocal movements. rI hese reciprocalmovement-compensating springs also operate, in conjunction with thevertical spring-rods 34, to impart a quick vertical throw or toss to thescreen against the bumper-screws as they pass their vertical centers,their action in this respect being as follows: Assuming that theconnecting-rods 19 and the links 14 and 17 are standing at the end oftheir backward and upward strokes, as shown in Fig. 7, as theeccentric-rod 53 moves forward in the direction of the arrow 80 thespring 61 pushes against the rock-arm 6() and pushes it ahead of it, andthis rock-arm, through the medium of the rockarms 39 and rock-shaft 41,moves the connecting-rods 19 and the links 14 and 17 also in thedirection of the arrow 81; but as the links and the crank-arm stand atan angle toward the direction in which the eccentric-rod is pushing theystart slower and move slower than the eccentric-rod is moving, whichcauses the rock-arm 60 to resist the push of the spring 61 and tocompress it between itself and the collar 58, while the tension of thespring 62 on the opposite side of the rock-arm 60 is relaxed. rEhecompression of the spring 61 takes place quickly, as the eccentric-rod,the rockarms, and the connectingrods make from one hundred and fifty totwo hundred and fifty reciprocations per minute. Consequently thecompression may be said to be practically instantaneous, and thiscompression continues until the links pass their Vertical centers. Thelinks are also assisted to resist the forward push of the compensatingspring 61 against the rock-arm 60 by the upward expansive tension of thevertical rods strike the adjustable bumper-screws.

34, the springs 37 of which exert a constant upward pressure against thedownward and forward movement of the links, as the links when movingfrom their position as shown by the dotted lines 82 move the screen 30down and compress the spring 37 on the vertical rods; but when the linkspass their vertical centers and swing up to the limit of the arc oftheir swinging movement as defined by their radius from the pivotedconnection to the brackets 7, 8, 9, and 10 they resiliently jerk thescreen up until its bumper-blcks onsequently when theconnecting-rods 19move the links forward the links force the screen downward against theresistance of the resilient pressure of the vertical spring-rods 34,which resistance further tends to compress the compensating spring 61.The resistance consequently increases until the links pass theirvertical center, when the resistance is instantly relieved, which causesthe compressed compensating spring to violently expand against therock-arm 60, causing it and the rock-arms 39 and connecting-rods'19 andthe -links 14 and 17 to jump violently forward in the forward upstrokeof the links, which are also thrown up by the upward expansive spring 37of the vertical rods 34. This quick upward movement of the links as theypass their vertical centers throws the screen bodilyupward until thebumper-blocks strike violently against the adjustable bumper-screws. Ifthe bumpers are set so that the bumper-blocks strike the bumper-screwsbefore the links complete their full stroke, the links andconnecting-rods stop also when the bumpers strike, but the eccentric-rod53 continues to the full limit of' its stroke by compressing the spring61, as above described. Thus these springs 61 and 62 form a compensatingyielding cushion for the variable vertical reciprocating strokes of thebumpers and the fixed stroke of the connecting-rod 53, by which thevertical reciprocal movement of the screen is effected. When theeccentric-rod makes its backward stroke, the links and connecting-rodsfollow in the same manner, and the compensating spring 62 on theopposite side of the rock-arm is compressed as the links move down andbackward to their vertical centers and compress the springs 37 of thevertical rods` and the instant the links pass their centers they and IOOIIO

the screen spring up, causing the screeni rod 57 imparts a horizontalreciprocating' movement to the screen 30, which cooperates with thevertical swinging movement et' the links, I preferably reciprocate thescreen horizontally in the reverse direction to the vertical swingingmovement of the links in order to reciprocate the screen in a straightervertical line than the links raise it with their swinging strokes. Thuswhen the connecting-rods and links are moving in the direction of thearrow and the screen under the action of the eccentric, which is securedto the opposite side of the shaft 54C, is moving' in the direction ofthe arrow 84 and is pushing against the upward lilt of the links a'lterthey pass their vertical centers and move upward the result is that thebackward horizontal movement ot' the screen is pushing against theforward upward straight movement of the screen due to the upward swingof the links, which naturally lifts the screen upward to one side of itsvertical alinemcnt.

Consequently the result of these counter movements is to litt andreciprocate the screen directly in a line at right angles to horizontalmovement of screen. This compound vertical and horizontal movement givesto the screen an intensity or' vibrating motion in the directions bestadapted to keep every particle of ore in intense live motion, whicheffectually sifts the liner particles oi" the granulated ore from thecoarser particles and prevents clogging', thus enabling the screen to beWorked to its fullest capacity.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is-

l. In a shaking-screen, a supporting-frame having brackets attachedthereto, a screen supported from said brackets by springcontrolled rodsand toggle-links depending from said brackets, connecting-rodsoperatively arranged to reciprocate saidlinks to impart a swingingvertical movement to said screen, an adjustable bumper' devicecomprising an adjustable bumper-head and bumper-brackets arrangedpartially on said supporting-frame and partly on said screen, adapted togive said screen a bump at the end of each of its upward verticalstrokes, an eccentric-rod pivotally secured at one end to said screenand operatively mounted on a suitable power rotating shaft at itsopposite end, a rock-shaft pivotally mounted in suitable bearingssecured to said supporting-frame, rock-arms secured A at one end on saidrock-shaft and pivotally connected at their opposite ends to saidconnecting-rods, a spring-controlled reciprocating device operativelyconnected at one end to said power rotating shaft and connected at itsopposite end to said rock-shaft for reciprocating said rock-arms, andadapted to permit variable movement between said screen and links andhaving said spring-controlled rods arranged and adapted to normally holdsaid screen under upward vertical tension and to rcsiliently impingesaid screen against said bumper' device, substantially as described.

2. ln a shaking-screen, the combination with the supporting-frame, thebrackets and the links, the casing comprising the bed-plates p votallyseemed to said links, the angle-irons secured to said bed-plate, and thescreen and sash su p ported by said vasing, of strips adapted to rest onthe side edges ol" said screen, brackets secured to one olE saidangIe-ir ns at the discharge end oi' said screen, arranged to projectover the adjacent ends of said side strips,` adjustable clamp-screwsthreaded to said arms to bear on the adjacent end ot' said clampingstrips, a slot in the opposite end of each oi said claniiping-strips, eyessecured to the end angleirons at the opposite end of said screen,eyebolts pivotally secured to said eyes, having' nuts threaded to theirends and arranged to swingl into the slots in the ends ot' saidclamping-strip and to clamp with their nuts said clamping-strips to saidscreen, substantially as described.

In a shaking-screen, the combination ol the supporting-trame, thebracket, the springcontrolled rods, the links and the screen pivotallysupported by said rods and links, with the adjustable connecting-rodspivotally attached to said links, and comprising the yokesectionsconnected to said links, the threaded screw-rod, secured to and adaptedto adjustably connect said yoke-sections together, the rods pivotallyconnected at one end to the adjacent yokes, the rock-arms pivotallysecured to the opposite ends of said rods, the rocksha'ft on which saidrock-arm is mounted, and means for rocking said rock-shaft,substantially as described.

4. in a shaking-screen the combination with a suitable supporting-frameof brackets a1'- rang'ed on opposite sides of said frame and atpredetermined distances apart, a screen suspended from said bracketsadjacent toits corners, toggle-links depending from said brackets, anoperative screen pivotally connected to the lower end of saidtoggle-links, connecting'- rods pivotally connected at one end with thecentral pivotal point of said links, rock-arms pivotally connected tothe opposite ends oli said connecting-rods between thc pivoted centersoitl said links, and means for reciprocating said rock-arms and saidconnecting-rods, substantially as described.

5. ln a shaking-screen,the combination with the supporting-r' rame, thetoggle-links depending from said supporting-trame, at one end, thescreen secured to the depending ends ot' said toggle-links, theconnecting-rods secured at one end to said toggle-links, the rock-shaftand rock-arms operatively connected to said connecting-rods, thepower-shaft, an eccentric secured. on said power-shaft, a connecting-rodIIO ' f extending from said eccentric, having' its free lars and saidrockarno, substantially as del end threaded, a rock-erm secured to seidroclscribed. IO shaft, an aperture in the free end of said roclr- Intestimony whereof I alx my signature in arm, through which saideccentric-rodextends presence of two witnesses.

5 loosely, a nut and collar on the threaded end JOHN A. TRAYLOR.

of said eccentric-rod on each side of seid rocli- /Vitnesses: arm, and acoiled spring on said eccentric-rod G. SARGENT ELLIOTT, 'l

on each side of said rock-arm between said col- HELEN B. YOUNKIN.

